That number should have been pre-programmed into the phone you received from your carrier. However, if you're using a device that came from another carrier you will most likely need to program in your particular carrier's voicemail access number.
On my 8320 here is how I would do that:
I bring up the phone application like I'm going to dial a number and press the Menu key. Select Options. Then select Voice Mail. Enter in the Access Number then press the Menu key and select Save.
Dave
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